During a visual inspection of a motor control center (MCC), you notice discoloration and charring around one circuit breaker. What is the most appropriate immediate action?
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A
Log the observation and schedule repair for the next maintenance window
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B
De-energize and lock out the affected circuit before further investigation
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C
Apply insulating spray to prevent arcing and continue operations
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D
Increase the breaker's trip setting to reduce nuisance tripping